11 of 14 Make more generic as well, as that was also the original question ("do other countries have religions on their ID too? Why or why not?") and is probably more useful as well

Why list religion on an ID card?

For example in Indonesia religion is listed on everyone's ID card (many religious conservatives demand that) but I don't see why it should be.

I've heard some claim that it's important so that when people die or get married, they don't marry to the wrong religion, but don't understand why this should be? You can just ask people's religion?

What is the purpose of listing the religion on an ID card?